Lendl is Murray's new coach

I agree, Novak is burning brightly at both ends with the whole grinding style of play. And just like Nadal he shall pay a physical price.He's going to be a major opponent for Andy for a long time, but I believe that momentum shall shift to Andy at some point later this year. Its up to Andy to have the balls to go for it & stamp his authority. And of-course get over his Nadal problem. That & taking out Federer in a slam are what is required at this stage for him to be really in the mix at slam time.

Del Potro is having problems making up for lost time. I'm not sure how much of a threat he is to Andy even at his best he always fell short.Andy had his number and could move him around. Still he is starting to look more threatening. But he is still young & presumably yet to peak. So in the future it could be different.He will need a bit more time before he can challenge the top 4. But he's already a problem for the rest.

Delpotro's best chance is on clay, the only surface he's beaten Andy on. On other surfaces his movement is not good so if opponents take the ball early and stop giving him time to set up that massive forehand, he can be beaten.Yes, do realise he got USOpen but that year Rafa had a stomach muscle injury and I don't know what happened to Fed. Also that year Delpot was on quite a run, not sure if he can replicate it.